DUMA (Detect Unintended Memory Access) stops your program on the exact
instruction that overruns (or underruns) a malloc() memory buffer. GDB
will then display the source-code line that causes the bug. It works by
using the virtual-memory hardware to create a red-zone at the border of
each buffer: touch that, and your program stops. It can catch formerly
impossible-to-catch overrun bugs. DUMA is a fork of Bruce Perens'
Electric Fence library.